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Your present location:News >> Industry News >> Prospect and Prospect of Bridge Plate Unit Straightening Machine

Prospect and Prospect of Bridge Plate Unit Straightening Machine

Number of visits: Date:2016-10-11

1Introduction

With the rapid development of China's economy, the application of steel structure is broader: ships, bridges, water conservancy, high-rise buildings, steel structure design, use, installation and other aspects have made great development, the domestic steel structure Production is also showing a trend of diversification, multi-purpose steel structure is now growing in domestic demand, especially in recent years, steel structure in the construction of the extensive application of the bridge, the original small equipment, single-head straightening machine can not meet the needs of large bridges and other projects. Bridge steel structure requires multiple U ribs or plate ribs and bottom plate unit welding, in the commonly used technology, a number of U ribs or plate ribs and base plate unit after welding deformation, the use of flame in the weld reverse heating way Flame correction, its low degree of automation, correction accuracy is poor, while easy to cause coarse grain steel plate. In order to meet the needs of large-scale bridge engineering, the development and application of multi-head bridge plate unit straightening machine will be developed rapidly and will be developed rapidly.

Brief introduction of multi - head straightening machine

Multi-head bridge plate unit is a straightening machine can simultaneously correct a number of plate (U) ribbed plate unit of the new hydraulic straightening machine, it applies to the correction of the larger floor area. It adopts roll-type correcting production process, through the lower drive roller drive work piece, in the upper and lower rollers to move between the roller, the work piece in the upper and lower rollers under the pressure roller extrusion deformation, to eliminate the plate unit Welding deformation caused by the floor. The correction range: bottom thickness: 40mm; floor width: 5000mm; maximum number of plates (U) ribs: 5-6 root.

 

 

Figure 1 is a schematic diagram of a multi-head bridge plate unit straightening machine comprising front and rear roller conveyors, side aligning devices, guide devices, gantry bodies, upper and lower presser rollers, After the floating roller and hydraulic devices, electrical control systems and other components. When the work piece hoisting on the roller conveyor before the side of the device is to start working to drive the workpiece on the guide device, the cylinder pressure to ensure that the workpiece in the transport process is not deviation. Before and after the floating roller in the workpiece delivery, to ensure smooth access to the host workpiece to protect the host does not accept the workpiece delivery impact. Roller conveyor conveying the workpiece before and after the rise of the floating roller, the workpiece into the host. The host began to correct the work, before and after the fall of the floating roller. The movable body of the upper pressing roller is a pressing device at the time of correction, and the moving body of the upper pressing roller can be adjusted according to the position of the workpiece plate (U) ribs and can be adjusted according to the thickness of the bottom plate. The upper pressing roller movable body has a lateral movement position display, and the lower transmission roller movable body can be adjusted synchronously or separately. Cylinder with pressure display, pressure roller shows the amount of pressure. The lower driving roller movable body can be adjusted synchronously with the moving body of the upper pressing roller according to the position of the workpiece plate rib and can be separately driven by the speed reducer and can be independently adjusted to the position of the work piece, Micro-whole. The lower drive roller moving body of the U ribbed plate unit is equipped with two lower support rollers. The spacing between the two support rollers can be adjusted according to the size of the U rib. Workpiece into the host, in the upper and lower roller moving roller moving body under the extrusion deformation of the deformation, to correct the purpose of the workpiece. 

 

3Several Key Points of Bridge Plate Plate Straightening Machine 

  

3.1 lateral positioning of the ram and the lower drive roller
According to the position parameter of the workpiece (U) rib, the position of the upper and lower drive rollers is preset (after the completion of each correcting work, the upper and lower rollers will return to the origin). In the automatic working state The lower roller and the lower driving roller enter the preset position; when the workpiece enters the main machine, the upper and lower driving rollers are separately fine-adjusted according to the actual position of the workpiece plate (U) ribs.

★ Multi-head Bridge Plate Unit Straightening Machine for Straightening Plate Plate Unit, which can finely adjust the distance between upper rollers according to the bottom plate thickness.

★ The multi-head bridge plate unit straightening machine for correcting the U ribbed plate unit, the lower drive roller moving body contains two lower support rollers, and the distance between the two support rollers can be adjusted according to the size of the U rib。  

3.2 protection during the correction measures
In order to prevent deviation during the workpiece correction, in addition to the front and rear roller conveyor with lateral alignment device and guide device, the pressure roller moving body is equipped with a position detector, can accurately reflect the plate (U) rib relative to the roller position , The workpiece moves beyond the allowable deviation, correct the opportunity to stop working to protect the workpiece deviation caused by damage to the corrector.

When the workpiece is transported, it ensures the workpiece to enter the host smoothly and protect the host from impact when the workpiece is transported. Host on both sides with a floating roller, roller conveyor conveying the workpiece before and after the rise of the floating roller, the workpiece into the host. The host began to correct the work, before and after the fall of the floating roller.

3.3 Determination of the correction parameters
Correction parameters set by the general thickness of the bottom plate, material and welding deformation of the decision.

The thickness of the bottom plate is different each time set the amount of deformation, the general thickness of the thicker plate deformation correction should be smaller (usually less than the amount of each deformation correction), the thickness of the bottom plate sometimes need to adjust the distance between the pressure roller; The more hard material correction deformation should be smaller; other welding deformation is also an important basis for setting the correction parameters, if the welding deformation is too large, subject to repeated correction.

Another problem faced by the multi-plate (U) ribbed plate element correction is that the middle part of the plate element is different from the deformation amount on both sides, and the height of the roller can be finely adjusted if the cylinder displacement is equal.  

3.4 correction of the amount of control
The control of the correction amount is the key to determine the correction accuracy.
Because the main working part of the straightening machine is the hydraulic cylinder, the stability of the position of the cylinder is the core of the whole straightening machine. It is required that the cylinder not only have the pressure display, but also have the digital display. For this reason, Displacement telescopic sensor high precision cylinder, by detecting the location of the cylinder plunger rod, accurate display under pressure, the accuracy of ≤ 0.5mm.

3.5 Terminal detection
After the work piece into the rear roller conveyor, roller conveyor equipment is equipped with photoelectric plane detection device. The workpiece passes the next workpiece, the workpiece is detected to be unqualified, and the rear roller conveyer sends the workpiece back to the front roller conveyor, and the workpiece undergoes secondary correction (correction parameter correction is required) until the workpiece is qualified.

4 Conclusion
Compared with the traditional rectification technology, the correction process of the multi-head bridge plate unit straightening machine is still in the initial stage, there are many places to be improved and perfected, but its unique high efficiency, practicability, and its correction accuracy is high . Has been recognized by many domestic shipyards.

With the rapid development of bridge construction, multi-head bridge straightener correction process in the country to promote, will further promote China's steel industry, the development of automated production technology, multi-head bridge plate unit correction machine market prospects worth the wait。

TypeInfo: Industry News

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